Combustion engine cylinder head casing



Sept. 2, 1952 p 5 2,608,965

' COMBUSTION ENGINE CYLINDER HEAD CASING Filed 001'.- 5, 1949 2 SHEETESHEET 1 INVENTOR GUSTAVv PI ELSTICK AT TO Rv N EYS P 2, 1952 5. PIELSTICK 2,608,965

COMBUSTION ENGINE CYLINDER HEAD CASING Filed Oct. 5, 1949 2 SHEETS-SHEET 2 INVENTOR orus'rAv PlELSflcK ATTOR NEYJ Patented Sept. 2, 1952 COMBUSTION ENGINE CYLINDER HEAD CASING' Gustav Pielsti ck, Saint-Germainen-Laye, France Application October 5, 1949, Serial No. 119,609 In France ctober'12, 1948 This inventionrelatesto combustion engines,

and more particularly to an improved casing structure for the cylinder head of a combustion engine. I

In most current types of easing structures for the cylinder heads of internal combustion engines and the like, thedifiiculty isencountered that access may not easily be had either to the valveoperating rocker leverage or to the securing means, such asnuts orscrewg-studs, of the detachable cylinder head. Furthermore, known cylinder head casings of the kind described do notgenerally have provision for supporting the pivots or rocker shafts, of the valve-actuating rockers outside theperiphery of the cylinder head; it is desirable so to support said pivots outside the cylinder head periphery.

It is an object of this invention to provide an improved casing construction for a cylinder head of a combustion engine, especially high-power engines, which ensures increased accessibility both to the cylinder head securing means and to the valve-operating rocker leverage enclosed in said casing. I

Another object is to provide such a cylinder head casing construction in which the pivots for the rocking valve-operating levers may be supported from the casing itself outside the periphery of the cylinder head, so as not substantially to transmit the stresses developed by said rockers in the operation of the valves to the area of the cylinder head, but substantially outside said area.

With the above and further objects in view, I essentially provide a casing for a cylinder head which comprises generally cylindrical walls upstanding from the cylinder head and forming a coaxial extension thereof, of such a diameter as to leave the cylinder head securing means, such as screw studs or nuts, substantially outside the periphery of said casing. The casing may be a casting or a press-formed sheet metal part. It may be formed with lateral extensions and bosses to house and support the valve-operating rockers, tappets, etc. I preferably provide a lightweight top cover removably sealing the casing and providing ready access to the parts contained therein.

An exemplary embodiment of my invention is illustrated by way of example and not of limitation in the accompanying drawings, in which:

Fig. 1 is a plan view of a cylinder head provided with the improved casing means, the cover of which has been removed to show the underlying valve-operating mechanism.

Claims. (c1.12s 90) 2v Fig. 2' is a vertical section'on line IP-II'of:

I Fig; 3 shows part of Fig. 2 ingreater detail;

and I Fig. 4 is a sectional view on line -IVIV of Fig.3

Asshown by way of illustration, my improved casing structure is applied to a. cylinder head I having'the usual securing studs or the like2for attaching it to the engine cylinder block, intake valves 3, 4 and exhaust valves 5, G. The operating levers or rockers for intake valves 3-,. 4 are shown at T, 8 and those for the exhaust valves 5, 9 are shown at 9, [9 in the form of a twoprongdlever. The intake actuating rockers 1, 8 are pivoted on a rocker shaft H while the twopronged exhaust-actuating rockers 9, ID are pivoted on the shaft I2. The valve-lifter tappets are shown at I3.

The casing 14 which may be a casting or a press-formed part is secured over the cylinder head I by means of lugs 15 and screws l6. As shown in Fig. l, the periphery of the casing I4 is arranged radially inwardly with respect to the circumferentially-spaced cylinder head-securing studs 2, which thus remain accessible after the casing I4 is mounted in position. The cylinder head is formed with a circumferential groove ll (see Fig. 2) containing a plastic gasket 18 or the like for sealing engagement of the casing 14 with the cylinder head I.

As previously stated, the casing M is formed with bosses such as I9, 20 in its sides for providing bearings for the rocker shafts ll, 12 respectively of the intake and exhaust-operating rockers I, 8 and 9, It). The outer arms of these rockers are housed and operate in a lateral extension 2| of the casing. The tappets such as 13 project upwardly into said extension 2| as shown in Fig. 2.

The casing i4 is sealed by means of a top cover 22, removably secured by means of a screw-stud provided with a knurled head 23 or similar means. As shown more particularly in Figs. 3 and 4, the screw 23 rigidly connects the cover 22 with a yokelike bridging member 24 having its respective arms secured to the top of a pair of elements 25, 26 defining bearings for the rocker shaft [2 of the exhaust-valve operating lever 9, I 0.

It will of course be understood that various modifications may be made in the structural details of the invention as hereinabove described and illustrated in connection with one specific embodiment thereof, without exceeding the scope of the invention.

What I claim is:

1. In a combustion engine having a cylinderblock and a cylinder-head and means securin said cylinder head to said cylinder-block, a cylinder-head casing comprising generally cylindrical walls adapted to be secured in upstanding relation from said cylinder head concentrically therewith, said cylindrical walls being of such diameter as to leave said cylinder-head securing means radially outside the periphery of said casing walls, and means securing said cylindrical casing to said cylinder head.

2. Cylinder head casing as in claim 1 which comprises a removable top cover to seal the same.

3. In a combustion engine having a cylinder block and cylinder head and means securing said cylinder head to said cylinder block, a cylinder;

head casing adapted to be secured in upstanding relation from said cylinder head concentrically therewith, the walls of said casing being of such a diameter as to leave said cylinder head securing means radially outside the periphery of said casing walls, means securing said casing to said cylinder head, usual valve means and rocking control levers in said cylinder head and bosses in said casing for the pivotal mounting of said levers, said bosses being adapted to absorb the stresses resulting from the operation of said valves, said bosses being located outside the area of the cylinder head in which said valve-means operate.

4. Cylinder-head casing as in claim 3 which comprises a removable top cover to seal the same. bearing bushing means surrounding one of the pivotal means for said valve-operating levers,

an upward extension for said bushing means with a screw threaded hole in the top thereof, and a headed screw means extending down through said cover into engagement with said screw-threaded hole to removably secure said top cover.

5. In a combustion engine, a cylinder-block, a cylinder head with a peripheral securing flange and securing studs spaced around said flange, said cylinder head having an active area in which valve means for said cylinder arelocated, pivotal rocker means for operating said valve means, and a cylinder head casing, said casing comprising generally cylindrical walls and means to secure said casing walls in upstanding relation from said active cylinder head area concentrically therewith in radially inward relation to said securing studs, and means in said cylindrical walls defining bearings to support the pivots for said rocker means, said bearings overlying a region substantially outside said active area whereby the operating stresses from said rocker means are not substantially transmitted to said active area, and a lateral extension in said casing to house the outer arms of said rockers.

GUSTAV PIELS'I'ICK.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 2,000,635 Edwards May '7, 1935 2,136,960 Wurtele Nov. 15, 1938 2,464,711 Paxman Mar. 15, 1949 

